Serial protocol interface for the Panasonic Penwriter, a portable typewriter that uses a plotter mechanism and tiny ballpoint pens to draw text and graphs to paper.  Having recently rediscovered my Penwriter, I looked online and found an effort to reverse engineer the 'undocumented' RS232 port on the side, so I pulled out the manual and discovered a section the protocol is in fact documented.  Since I couldn't find a single copy of the manual on the internet, I've scanned the protocol section and posted it here.

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